sysdeps/gnu/netinet/tcp.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
  30  */
  31
  32 #ifndef _NETINET_TCP_H
  33 #define _NETINET_TCP_H  1
  34
  35 #include <features.h>
  36
  37 /*
  38  * User-settable options (used with setsockopt).
  39  */
  40 #define TCP_NODELAY      1      /* Don't delay send to coalesce packets  */
  41 #define TCP_MAXSEG       2      /* Set maximum segment size  */
  42 #define TCP_CORK         3      /* Control sending of partial frames  */
  43 #define TCP_KEEPIDLE     4      /* Start keeplives after this period */
  44 #define TCP_KEEPINTVL    5      /* Interval between keepalives */
  45 #define TCP_KEEPCNT      6      /* Number of keepalives before death */
  46 #define TCP_SYNCNT       7      /* Number of SYN retransmits */
  47 #define TCP_LINGER2      8      /* Life time of orphaned FIN-WAIT-2 state */
  48 #define TCP_DEFER_ACCEPT 9      /* Wake up listener only when data arrive */
  49 #define TCP_WINDOW_CLAMP 10     /* Bound advertised window */
  50 #define TCP_INFO         11     /* Information about this connection. */
  51 #define TCP_QUICKACK     12     /* Bock/reenable quick ACKs.  */
  52 #define TCP_CONGESTION   13     /* Congestion control algorithm.  */
  53 #define TCP_MD5SIG       14     /* TCP MD5 Signature (RFC2385) */
  54
  55 #ifdef __USE_MISC
  56 # include <sys/types.h>
  57
  58 # ifdef __FAVOR_BSD
  59 typedef u_int32_t tcp_seq;
  60 /*
  61  * TCP header.
  62  * Per RFC 793, September, 1981.
  63  */
  64 struct tcphdr
  65   {
  66     u_int16_t th_sport;         /* source port */
  67     u_int16_t th_dport;         /* destination port */
  68     tcp_seq th_seq;             /* sequence number */
  69     tcp_seq th_ack;             /* acknowledgement number */
  70 #  if __BYTE_ORDER == __LITTLE_ENDIAN
  71     u_int8_t th_x2:4;           /* (unused) */
  72     u_int8_t th_off:4;          /* data offset */
  73 #  endif
  74 #  if __BYTE_ORDER == __BIG_ENDIAN
  75     u_int8_t th_off:4;          /* data offset */
  76     u_int8_t th_x2:4;           /* (unused) */
  77 #  endif
  78     u_int8_t th_flags;
  79 #  define TH_FIN        0x01
  80 #  define TH_SYN        0x02
  81 #  define TH_RST        0x04
  82 #  define TH_PUSH       0x08
  83 #  define TH_ACK        0x10
  84 #  define TH_URG        0x20
  85     u_int16_t th_win;           /* window */
  86     u_int16_t th_sum;           /* checksum */
  87     u_int16_t th_urp;           /* urgent pointer */
  88 };
  89
  90 # else /* !__FAVOR_BSD */
  91 struct tcphdr
  92   {
  93     u_int16_t source;
  94     u_int16_t dest;
  95     u_int32_t seq;
  96     u_int32_t ack_seq;
  97 #  if __BYTE_ORDER == __LITTLE_ENDIAN
  98     u_int16_t res1:4;
  99     u_int16_t doff:4;
 100     u_int16_t fin:1;
 101     u_int16_t syn:1;
 102     u_int16_t rst:1;
 103     u_int16_t psh:1;
 104     u_int16_t ack:1;
 105     u_int16_t urg:1;
 106     u_int16_t res2:2;
 107 #  elif __BYTE_ORDER == __BIG_ENDIAN
 108     u_int16_t doff:4;
 109     u_int16_t res1:4;
 110     u_int16_t res2:2;
 111     u_int16_t urg:1;
 112     u_int16_t ack:1;
 113     u_int16_t psh:1;
 114     u_int16_t rst:1;
 115     u_int16_t syn:1;
 116     u_int16_t fin:1;
 117 #  else
 118 #   error "Adjust your <bits/endian.h> defines"
 119 #  endif
 120     u_int16_t window;
 121     u_int16_t check;
 122     u_int16_t urg_ptr;
 123 };
 124 # endif /* __FAVOR_BSD */
 125
 126 enum
 127 {
 128   TCP_ESTABLISHED = 1,
 129   TCP_SYN_SENT,
 130   TCP_SYN_RECV,
 131   TCP_FIN_WAIT1,
 132   TCP_FIN_WAIT2,
 133   TCP_TIME_WAIT,
 134   TCP_CLOSE,
 135   TCP_CLOSE_WAIT,
 136   TCP_LAST_ACK,
 137   TCP_LISTEN,
 138   TCP_CLOSING   /* now a valid state */
 139 };
 140
 141 # define TCPOPT_EOL             0
 142 # define TCPOPT_NOP             1
 143 # define TCPOPT_MAXSEG          2
 144 # define TCPOLEN_MAXSEG         4
 145 # define TCPOPT_WINDOW          3
 146 # define TCPOLEN_WINDOW         3
 147 # define TCPOPT_SACK_PERMITTED  4               /* Experimental */
 148 # define TCPOLEN_SACK_PERMITTED 2
 149 # define TCPOPT_SACK            5               /* Experimental */
 150 # define TCPOPT_TIMESTAMP       8
 151 # define TCPOLEN_TIMESTAMP      10
 152 # define TCPOLEN_TSTAMP_APPA    (TCPOLEN_TIMESTAMP+2) /* appendix A */
 153
 154 # define TCPOPT_TSTAMP_HDR      \
 155     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
 156
 157 /*
 158  * Default maximum segment size for TCP.
 159  * With an IP MSS of 576, this is 536,
 160  * but 512 is probably more convenient.
 161  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 162  */
 163 # define TCP_MSS        512
 164
 165 # define TCP_MAXWIN     65535   /* largest value for (unscaled) window */
 166
 167 # define TCP_MAX_WINSHIFT       14      /* maximum window shift */
 168
 169 # define SOL_TCP                6       /* TCP level */
 170
 171
 172 # define TCPI_OPT_TIMESTAMPS    1
 173 # define TCPI_OPT_SACK          2
 174 # define TCPI_OPT_WSCALE        4
 175 # define TCPI_OPT_ECN           8
 176
 177 /* Values for tcpi_state.  */
 178 enum tcp_ca_state
 179 {
 180   TCP_CA_Open = 0,
 181   TCP_CA_Disorder = 1,
 182   TCP_CA_CWR = 2,
 183   TCP_CA_Recovery = 3,
 184   TCP_CA_Loss = 4
 185 };
 186
 187 struct tcp_info
 188 {
 189   u_int8_t      tcpi_state;
 190   u_int8_t      tcpi_ca_state;
 191   u_int8_t      tcpi_retransmits;
 192   u_int8_t      tcpi_probes;
 193   u_int8_t      tcpi_backoff;
 194   u_int8_t      tcpi_options;
 195   u_int8_t      tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
 196
 197   u_int32_t     tcpi_rto;
 198   u_int32_t     tcpi_ato;
 199   u_int32_t     tcpi_snd_mss;
 200   u_int32_t     tcpi_rcv_mss;
 201
 202   u_int32_t     tcpi_unacked;
 203   u_int32_t     tcpi_sacked;
 204   u_int32_t     tcpi_lost;
 205   u_int32_t     tcpi_retrans;
 206   u_int32_t     tcpi_fackets;
 207
 208   /* Times. */
 209   u_int32_t     tcpi_last_data_sent;
 210   u_int32_t     tcpi_last_ack_sent;     /* Not remembered, sorry.  */
 211   u_int32_t     tcpi_last_data_recv;
 212   u_int32_t     tcpi_last_ack_recv;
 213
 214   /* Metrics. */
 215   u_int32_t     tcpi_pmtu;
 216   u_int32_t     tcpi_rcv_ssthresh;
 217   u_int32_t     tcpi_rtt;
 218   u_int32_t     tcpi_rttvar;
 219   u_int32_t     tcpi_snd_ssthresh;
 220   u_int32_t     tcpi_snd_cwnd;
 221   u_int32_t     tcpi_advmss;
 222   u_int32_t     tcpi_reordering;
 223
 224   u_int32_t     tcpi_rcv_rtt;
 225   u_int32_t     tcpi_rcv_space;
 226
 227   u_int32_t     tcpi_total_retrans;
 228 };
 229
 230
 231 /* For TCP_MD5SIG socket option.  */
 232 #define TCP_MD5SIG_MAXKEYLEN    80
 233
 234 struct tcp_md5sig
 235 {
 236   struct __kernel_sockaddr_storage tcpm_addr;   /* Address associated.  */
 237   u_int16_t     __tcpm_pad1;                    /* Zero.  */
 238   u_int16_t     tcpm_keylen;                    /* Key length.  */
 239   u_int32_t     __tcpm_pad2;                    /* Zero.  */
 240   u_int8_t      tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary).  */
 241 };
 242
 243 #endif /* Misc.  */
 244
 245 #endif /* netinet/tcp.h */